Markers in ASP.NET Core Maps Component

18 Nov 20185 minutes to read

Markers are notes that are used to leave a message on the Maps. It indicates or marks a specific location with desired symbols on the Maps. It can be enabled by setting the Visible property of the MapsMarker to true.

Adding marker

To add the markers, the DataSource property of the MapsMarker has a list of objects that contains the data for markers. Using this property, any number of markers can be added to the layers of the Maps. By default, it displays the markers based on the specified latitude and longitude in the given data source. Each data source object contains the following list of properties.

• latitude - The latitude point which determines the X location of the marker.
• longitude - The longitude point which determines the Y location of the marker.

Adding marker template

The Marker can be added as a template in the Maps component. The Template property of the MapsMarker is used to set the HTML element or id of an element as a template.

Customization

The following properties are available in MapsMarker class to customize the Markers of the Maps component.

• Border - To customize the color, width and opacity of the border for the markers in Maps.
• Fill - To apply the color for markers in Maps.
• DashArray - To define the pattern of dashes and gaps that is applied to the outline of the markers in Maps.
• Height - To customize the height of the markers in Maps.
• Width - To customize the width of the markers in Maps.
• Offset - To customize the position of the markers in Maps.
• Opacity - To customize the transparency of the markers in Maps.
• AnimationDelay - To change the time delay in the transition for markers.
• AnimationDuration - To change the time duration of animation for markers.

Marker shapes

The Maps component supports the following marker shapes. To set the shape of the marker, the Shape property in MapsMarker is used.

• Balloon
• Circle
• Cross
• Diamond
• Image
• Rectangle
• Start
• Triangle
• VerticalLine
• HorizontalLine

Rendering marker shape as image

To render a marker as an image in Maps, set the Shape property of MapsMarker as Image and specify the path of the image to ImageUrl property. There is another way to render a marker as an image using the ImageUrlValuePath property of the MapsMarker. Bind the field name that contains the path of the image in the data source to the ImageUrlValuePath property.

Multiple marker groups

Multiple groups of markers can be added in the Maps by adding multiple MapsMarker in the MapsMarkers and customization for the markers can be done with the MapsMarker.

Customize marker shapes from data source

Bind different colors and shapes to the marker from data source

Using the ShapeValuePath and ColorValuePath properties, the color and shape of the marker can be applied from the given data source. Bind the data source to the DataSource property of the MapsMarker class and set the field names that contains the shape and color values in the data source to the ShapeValuePath and ColorValuePath properties.

Setting value path from the data source

The latitude and longitude values are used to determine the location of each marker in the Maps. The LatitudeValuePath and LongitudeValuePath properties are used to specify the value path that presents in the data source of the marker. In the following example, the field name from the data source is set to the LatitudeValuePath and LongitudeValuePath properties.

Setting different sizes for markers individually

Repositioning the marker using drag and drop

Marker zooming

The Maps can be initially scaled to the center value based on the marker distance. This can be achieved by setting the ShouldZoomInitially property in MapsZoomSettings as true.

Marker clustering

Maps support hiding and clustering markers when they overlap. The number on a cluster indicates how many overlapping markers it contains. When zooming into any cluster location on the map, the number on the cluster decreases, and individual markers become visible. When zooming out, the overlapping markers increase, causing them to cluster again, which increases the count on the cluster.

Customization of marker cluster

The following properties are available to customize the marker clustering in the Maps component.

• Border - To customize the color, width and opacity of the border of cluster in Maps.
• ConnectorLineSettings - To customize the connector line in cluster separating the markers.
• DashArray - To customize the dash array for the marker cluster in Maps.
• Fill - Applies the color of the cluster in Maps.
• Height - To customize the height of the marker cluster in Maps.
• ImageUrl - To customize the URL path for the marker cluster when the cluster shape is set as image in Maps.
• LabelStyle - To customize the text in marker cluster.
• Offset - To customize the offset position for the marker cluster in Maps.
• Opacity - To customize the opacity of the marker cluster.
• Shape - To customize the shape for the cluster of markers.
• Width - To customize the width of the marker cluster in Maps.

Expanding the marker cluster

The cluster is formed by grouping an identical and non-identical marker from the surrounding area. By clicking on the cluster and setting the AllowClusterExpand property in MapsMarkerClusterSettings as true to expand the identical markers. If zooming is performed in any of the locations of the cluster, the number on the cluster will decrease and the overlapping marker will be split into an individual marker on the map. When performing zoom out, it will increase the marker count and then cluster it again.

Clustering markers within each marker group

Tooltip for marker

Tooltip is used to display more information about a marker on mouse over or touch end event. This can be enabled separately for marker by setting the Visible property of MapsTooltipSettings to true. The ValuePath property in the MapsTooltipSettings takes the field name that presents in dataSource and displays that value as tooltip text.